* compare support was completely broken, a wonder that the code ever
  seemed to work at all
* comparison of the actual Composition was missing; comparing
  Compositions is a bit tricky due to many isomorphisms in the
  definition
* opted to compare area utilization instead: Unlikely that two different
  compositions in the same DSE run will ever have _exactly_ the same
  number of LUTs, FFS, etc.
* should work now, comparison order: area, h-value, frequency